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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 650 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.77² =
  2. 2.39² =
  3. 3.91² =
  4. 4.59² =
  5. 5.67² =
  6. 6.56² =
  7. 7.55² =
  8. 8.34² =
  9. 9.42² =
  10. 10.32² =
  11. 11.87² =
  12. 12.78² =
  13. 13.92² =
  14. 14.47² =
  15. 15.71² =
  16. 16.45² =
  17. 17.79² =
  18. 18.93² =
  19. 19.49² =
  20. 20.69² =
  21. 21.63² =
  22. 22.31² =
  23. 23.62² =
  24. 24.86² =
  25. 25.66² =
  26. 26.84² =
  27. 27.57² =
  28. 28.36² =
  29. 29.61² =
  30. 30.82² =
  31. 31.68² =
  32. 32.98² =
  33. 33.43² =
  34. 34.54² =
  35. 35.65² =
  36. 36.48² =
  37. 37.76² =
  38. 38.37² =
  39. 39.85² =
  40. 40.74² =

Answer key

  1. 5929
  2. 1521
  3. 8281
  4. 3481
  5. 4489
  6. 3136
  7. 3025
  8. 1156
  9. 1764
  10. 1024
  11. 7569
  12. 6084
  13. 8464
  14. 2209
  15. 5041
  16. 2025
  17. 6241
  18. 8649
  19. 2401
  20. 4761
  21. 3969
  22. 961
  23. 3844
  24. 7396
  25. 4356
  26. 7056
  27. 3249
  28. 1296
  29. 3721
  30. 6724
  31. 4624
  32. 9604
  33. 1849
  34. 2916
  35. 4225
  36. 2304
  37. 5776
  38. 1369
  39. 7225
  40. 5476

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